19720430 has 32 divisors (see below), whose sum is σ = 37324800. Its totient is φ = 7487392.

The previous prime is 19720403. The next prime is 19720447. The reversal of 19720430 is 3402791.

It is a self number, because there is not a number n which added to its sum of digits gives 19720430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40931 + ... + 41409.

It is an arithmetic number, because the mean of its divisors is an integer number (1166400).

Almost surely, 2^19720430 is an apocalyptic number.

19720430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19720430 is a deficient number, since it is larger than the sum of its proper divisors (17604370).

19720430 is a wasteful number, since it uses less digits than its factorization.

19720430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 19720430 is about 4440.7690775360. The cubic root of 19720430 is about 270.1710393182.

The spelling of 19720430 in words is "nineteen million, seven hundred twenty thousand, four hundred thirty".